If your world is limited, and almost all you do is being a web monkey, by all means, drone yourself to always use taint.
I only use taint if my program has to potential to do something the caller isn't able to - and if the caller is potentially hostile. But I write a large numbers of programs that run under the same privileges the user already has.
I think one should always think whether you should use taint mode or not. And use it when appropriate. Neither "always use taint" nor "never use taint" appeals to me.